131 lines
5.8 KiB
HTML
131 lines
5.8 KiB
HTML
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<html>
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<!-- Copyright (C) 1988-2016 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Using the GNU Compiler Collection (GCC): ARC Function Attributes</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC): ARC Function Attributes">
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<meta name="keywords" content="Using the GNU Compiler Collection (GCC): ARC Function Attributes">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Function-Attributes.html#Function-Attributes" rel="up" title="Function Attributes">
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<link href="ARM-Function-Attributes.html#ARM-Function-Attributes" rel="next" title="ARM Function Attributes">
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<link href="AArch64-Function-Attributes.html#AArch64-Function-Attributes" rel="prev" title="AArch64 Function Attributes">
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="ARC-Function-Attributes"></a>
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<div class="header">
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<p>
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Next: <a href="ARM-Function-Attributes.html#ARM-Function-Attributes" accesskey="n" rel="next">ARM Function Attributes</a>, Previous: <a href="AArch64-Function-Attributes.html#AArch64-Function-Attributes" accesskey="p" rel="prev">AArch64 Function Attributes</a>, Up: <a href="Function-Attributes.html#Function-Attributes" accesskey="u" rel="up">Function Attributes</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="ARC-Function-Attributes-1"></a>
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<h4 class="subsection">6.31.3 ARC Function Attributes</h4>
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<p>These function attributes are supported by the ARC back end:
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</p>
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<dl compact="compact">
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<dt><code>interrupt</code></dt>
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<dd><a name="index-interrupt-function-attribute_002c-ARC"></a>
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<p>Use this attribute to indicate
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that the specified function is an interrupt handler. The compiler generates
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function entry and exit sequences suitable for use in an interrupt handler
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when this attribute is present.
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</p>
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<p>On the ARC, you must specify the kind of interrupt to be handled
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in a parameter to the interrupt attribute like this:
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</p>
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<div class="smallexample">
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<pre class="smallexample">void f () __attribute__ ((interrupt ("ilink1")));
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</pre></div>
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<p>Permissible values for this parameter are: <code>ilink1</code><!-- /@w --> and
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<code>ilink2</code><!-- /@w -->.
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</p>
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</dd>
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<dt><code>long_call</code></dt>
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<dt><code>medium_call</code></dt>
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<dt><code>short_call</code></dt>
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<dd><a name="index-long_005fcall-function-attribute_002c-ARC"></a>
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<a name="index-medium_005fcall-function-attribute_002c-ARC"></a>
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<a name="index-short_005fcall-function-attribute_002c-ARC"></a>
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<a name="index-indirect-calls_002c-ARC"></a>
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<p>These attributes specify how a particular function is called.
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These attributes override the
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<samp>-mlong-calls</samp> and <samp>-mmedium-calls</samp> (see <a href="ARC-Options.html#ARC-Options">ARC Options</a>)
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command-line switches and <code>#pragma long_calls</code> settings.
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</p>
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<p>For ARC, a function marked with the <code>long_call</code> attribute is
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always called using register-indirect jump-and-link instructions,
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thereby enabling the called function to be placed anywhere within the
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32-bit address space. A function marked with the <code>medium_call</code>
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attribute will always be close enough to be called with an unconditional
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branch-and-link instruction, which has a 25-bit offset from
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the call site. A function marked with the <code>short_call</code>
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attribute will always be close enough to be called with a conditional
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branch-and-link instruction, which has a 21-bit offset from
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the call site.
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</p></dd>
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</dl>
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</body>
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</html>
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